That article doesn't actually counter what the OP says. In fact it ends by stating that SS is being more strained and giving diminishing returns as time passes by, which sounds disturbingly like a ponzi scheme. It's unsustainable by design even without free-riders, much less with min-maxers gaming the system to not put anything in.
I don't know why you think social security is necessarily unsustainable. It's been running a massive surplus since the 80s. Unfortunately it was borrowed from to finance wars in the middle east, but that's not a problem with social security.
